math
posted by john .
name 2 fact families that have only 2 equations

I'm not sure what you are asking.
Since I am not familiar with "fact families," I searched Google under the key words "'fact families' math" to get these possible sources:
http://www.mathcats.com/explore/factfamilycards.html
(Broken Link Removed)
http://www.theschoolbell.com/Links/math/number_families/main/index.html
http://www.geocities.com/ljacoby_2000/math.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
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